Abstract: A system for semi-automatically closing flexible containers includes a continuous deformable web and a semi-automatic device for closing containers with the web. The device includes a frame having a slot for receiving an open end of one container at a time, feeding means for feeding the web, web cutting means and deforming and closing means. The web has labels integrally joined thereto at a substantially constant distance from each other, to thereby form a labeled web having a predetermined cross section. The cutting means are configured to cut the web into sections whose length is equal to the distance and to form labeled clips with the labels located halfway of the sections, The deforming and closing means are coordinated with the cutting means to deform and close each labeled clip around the open end of one container at a time while keeping the labels centered on each container.